New data on the kinetics of the dissolution of alkali feldspars at 200°C in CO2 charged water
New data on the kinetics of the dissolution of alkali feldspars at 200°C in CO2 charged water
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200°C 碱长石在充有 CO2 的水中溶解动力学的新数据
DOI：
10.1016/0016-7037(76)90173-3
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发表时间：
1976
影响因子：
5
通讯作者：
M. Lagache
中科院分区：
文献类型：
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作者：
M. Lagache
a （Na）溶解动力学。在200°C的实验条件下，研究了含co2的水中的K)苯胺，作为表面积s和时间的函数。已根据产物绘制了Na+和K+的质量摩尔浓度。至于钠长石和adularia (Lagache,Bull。Soc。Fr,矿物。Cristallogr.88, 223-253, 1965)， na2和K+的溶解速率是st的光滑连续函数，这意味着它们是由溶液的组成控制的。纯钠长石或钾长石与中间长石的溶蚀作用比较表明，钾长石的溶蚀作用与钠长石和钾长石颗粒的溶蚀比例相一致。赫尔格森（地球化学）提出的理论考虑。Cosmochim。中国生物医学工程学报，2011；长石，第184-217页，1972年)和pa<s:1>（地球化学）。Cosmochim。本文回顾了Acta37, 2641-2663, 1973)：两者都从我的第一个实验结果中提出，溶解可以用通过反应产物表层的扩散传质过程来描述。目前的实验不同意这种溶解机制的解释。
The kinetics of the dissolution of a (Na. K) sanidine in CO2-charged water, were studied experimentally at 200°C as a function of the surface area s and of the timet. The molalities of Na+and K+have been plotted against the productst. As for albite and adularia (Lagache,Bull. Soc. Fr. Minéral. Cristallogr.88, 223–253, 1965), the rates of dissolution of Na2and K+are smooth continuous functions ofst, which implies that they are controlled by the composition of the solution.The comparison between the dissolution of pure sodic or potassic feldspars and that of an intermediate feldspar shows that the sanidine dissolves as if it were composed of albite and K-feldspar grains in the proportions corresponding to its composition.Theoretical considerations presented byHelgeson(Geochim. Cosmochim. Acta35, 421–169, 1971;The Feldspars, pp. 184–217, 1972) andPačes(Geochim. Cosmochim. Acta37, 2641–2663, 1973) are reviewed: both had suggested, arguing from my first experimental results, that the dissolution could be described by a process of diffusional mass transfer through a surface layer of reaction products.The present experiments do not agree with such an interpretation of the mechanism of dissolution.